Xcel Energy Colorado is the state's biggest power utility. It serves 1.6 million customers, most of them in its Denver-metro ...

When aviation pioneer Bertrand Piccard a decade ago spearheaded a much-hyped flight around the world in a plane powered by sunlight, it raised awareness about climate change but held little promise of ...

Work to give 21st-century London yet another skyscraper has uncovered traces — in fact chunks — of the city's origins almost 2,000 years ago.

A First Amendment dispute over a bright painting that shows sunbeams shining down on a mountain range made of ...

A Texas county on Wednesday approved holding an election sought by SpaceX that would let residents living around billionaire ...

Vietnam's industrial boom drives global coal imports to new highs 6:03 AM UTC Indonesia is aiming to increase the share of renewable energy under its electricity supply plan over the next ten ...